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POPSVaTech, D.O.E, Russians, collaborators study rare microorganism that produces hydrogen So we finally found a clean energy solution ? guess not - no2liberals writes "I’m all for new sources of energy, but one has to look at the downside. The only emission from hydrogen as a fuel is water vapor, which happens to be the single greatest greenhouse gas. Do we really want vehicles and power plants spewing more of the gas that traps 80% of all radiant heat within the first thirty feet of atmosphere?"